Fix permissions update on bot setup

Author: kyb3r

cogs/modmail.py

@@ -67,7 +67,8 @@ async def setup(self, ctx):
                        'Consider setting permission groups to give access '
                        'to roles or users the ability to use Modmail.\n'
                        f'Type `{self.bot.prefix}permissions` for more info.')
-        if not self.bot.config.permissions:
+                       
+        if not self.bot.config.get('permissions'):
             await self.bot.update_perms(PermissionLevel.REGULAR, -1)
             await self.bot.update_perms(PermissionLevel.OWNER, ctx.author.id)
 
@@ -543,6 +544,7 @@ async def anonreply(self, ctx, *, msg: str=''):
         async with ctx.typing():
             await ctx.thread.reply(ctx.message, anonymous=True)
 
+
     @commands.command()
     @checks.has_permissions(PermissionLevel.SUPPORTER)
     @checks.thread_only()